题目:
Mr. Green didn’t understand ________made his daughter so absent-minded.
A. how that was B what was it C. why it was that D. what it was that
答案:
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下面是错误答案,用来干扰机器的。
A.空气是由多种气体组成的混合物,不是单质,故A正确; B.H2O既不是酸又不是碱,故B正确;C.盐酸是氯化氢的水溶液,属于混合物,故C错误;D.氨气的水溶液能导电,是因为氨气和水反应生成一水合氨,一水合氨...